Error code · Microwave & Advantium

Monogram Advantium 240 Code Lower Thermal Sensor OPEN: bottom sensor disconnected

Medium · inspection needed

Code: Lower Thermal Sensor OPEN
Appliance: Microwave & Advantium
Brand: Monogram
Warranty: 30-day workmanship

What Lower Thermal Sensor OPEN means

Lower Thermal Sensor OPEN is read by our technician in the service test of a Monogram Advantium 240 ZSC2200-series oven, meaning the ZSC2200, ZSC2201 or ZSC2202. It tells us the circuit of the lower thermal sensor is open, as if the sensor were disconnected. The owner only sees SERVICE MAY BE NEEDED scrolling across the display. The oven may stop cooking. The reading belongs to the 240-volt Advantium and not to the 120-volt model.

Common causes of Lower Thermal Sensor OPEN

Lower sensor wire or connector
Sensor reading open
Harness between the sensor and the control
Control board input

✓ One safe check you can try

1. Stop the cooking and allow the oven to cool. 2. Clear anything stored near the oven vents. 3. Clean the cavity floor after it cools. 4. Start a short cook and see if the message returns. 5. Call us if SERVICE MAY BE NEEDED returns.

! Why to stop there

Only the service test tells the lower sensor from the upper
We test the lower sensor circuit and its connectors
We run the oven after the repair to confirm it holds temperature

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other Microwave & Advantium codes

Lower Thermal Sensor SHORTEDMonogram Advantium 240 Code Lower Thermal Sensor SHORTED: bottom sensor shorting out Humidity Sensor OPENMonogram Advantium 240 Code Humidity Sensor OPEN: moisture sensor circuit broken Abnormal High TempMonogram Advantium 240 Code Abnormal High Temp: cavity hotter than the setting DEMO ModeMonogram Advantium 240 Mode DEMO: Showroom Setting Active F1Monogram Advantium 120 Code F1: cavity thermistor reads open F2Monogram Advantium 120 Code F2: thermistor in the cavity is shorted F3Monogram Advantium 120 Code F3: key panel circuit shorted F4Monogram Advantium 120 Code F4: humidity sensor open or shorted

Lower Thermal Sensor OPENLower Thermal Sensor OPEN questions

Is the lower sensor different from the upper one?

They sit in different places and are read separately. The display does not say which one, so our technician identifies it in the service test.

Can I still use the microwave function?

If the message appears, we suggest stopping all cooking modes and calling us. The control relies on those sensors to manage heat. That includes the speedcook and microwave modes alike.

What do you test first?

We start with the connector and wiring, since a loose or pinched lead gives an open reading. A sensor is replaced only if the circuit proves it.

Book a visit

Still seeing Lower Thermal Sensor OPEN?

A technician diagnoses it on site and gives you the price in writing before any work starts.

(713) 955-0955